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Old 21-07-2003, 10:14 PM
Theo Asir
 
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Default Any effect of dormant spray on companion plants?


"Daniel Hanna" wrote in message
home.com.au...
In Kirra wrote:
It is only used after
pruning because it will damage any fresh growth (or any leaves) on the
roses.


Actually, Kirra, it can be used any time of the year. Even the Yates
product instructions say that (I've got a bottle myself!). You just use
it at 10 ml per litre of spray instead of 20 ml/L.

I've used it on powdery mildew mid season, to great effect. No foliage
burning problems, but it did make the foliage smell awful. The side
benefit of this was that a rogue possum decided that my roses were now a
bit too spicy for its palate. Awww.


My blackspot is made of sterner stuff
unfortunately. At such low concentrations
dormant spray has almost no effect.
As it is I spray @ 50% above recommended
concentration and I add dormant oil to increase
spore killing effects.

When I get a really uncontrollable case of B.S.
I have been known to nuke the plant with dormant
spray to get new leaves. Just did it to a 1 Gallon
store rescue Penelope. The tempreture was 92 degrees
and in 3 hours all leaves were scorched. Within the week
the plant had all new disease free foliage.

Powdery mildew I've learnt to ignore. My summers get 100F+
very quickly and the mildew just gets burnt off though I
did do battle with a severe case on my Fairy this year.

but seriously the smell disuades anything but winter spray.
As it is I can still smell last winters spray in certain patches
even after remulching.

I've even had burns from the cornell formula @ anything
above 80F, and this contains as much dormant oil
as The spray. Not all roses but frequently enough
to give pause.

--
Theo in Zone 5
Kansas City
Waiting for rain......


  #17   Report Post  
Old 21-07-2003, 10:25 PM
Theo Asir
 
Posts: n/a
Default Any effect of dormant spray on companion plants?


"Daniel Hanna" wrote in message
home.com.au...
In Kirra wrote:
It is only used after
pruning because it will damage any fresh growth (or any leaves) on the
roses.


Actually, Kirra, it can be used any time of the year. Even the Yates
product instructions say that (I've got a bottle myself!). You just use
it at 10 ml per litre of spray instead of 20 ml/L.

I've used it on powdery mildew mid season, to great effect. No foliage
burning problems, but it did make the foliage smell awful. The side
benefit of this was that a rogue possum decided that my roses were now a
bit too spicy for its palate. Awww.


My blackspot is made of sterner stuff
unfortunately. At such low concentrations
dormant spray has almost no effect.
As it is I spray @ 50% above recommended
concentration and I add dormant oil to increase
spore killing effects.

When I get a really uncontrollable case of B.S.
I have been known to nuke the plant with dormant
spray to get new leaves. Just did it to a 1 Gallon
store rescue Penelope. The tempreture was 92 degrees
and in 3 hours all leaves were scorched. Within the week
the plant had all new disease free foliage.

Powdery mildew I've learnt to ignore. My summers get 100F+
very quickly and the mildew just gets burnt off though I
did do battle with a severe case on my Fairy this year.

but seriously the smell disuades anything but winter spray.
As it is I can still smell last winters spray in certain patches
even after remulching.

I've even had burns from the cornell formula @ anything
above 80F, and this contains as much dormant oil
as The spray. Not all roses but frequently enough
to give pause.

--
Theo in Zone 5
Kansas City
Waiting for rain......


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